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==External hernias==
[http://w3.vet.cornell.edu/nst/nst.asp?Fun=Image&imgID=22114 Image of congenital umbilical hernia in a pig from Cornell Veterinary Medicine]
*Abnormally large openings e.g. inguinal canal
*Persistent fetal openings e.g. umbilical hernia
*Defects of closure of abdominal cavity e.g. congenital diaphragmatic hernia[[Category:Peritoneal_Cavity_-_Developmental_Pathology]]